Welcome to Defender Canada! 
MaryKate On & Off Hull & Bottom Cleaner Item # 871924
Description
Features:
- CRC/Marykate On & Off Hull & Bottom Cleaner works instantly to remove the toughest waterline stains, algae and barnacle stains, rust and gas exhaust stains
- Specifically formulated for use on fiberglass
- Will not harm gelcoat
- Not for Use on Metals or Painted Surfaces
- Easy brush-on/rinse-off application
- Water based and non-flammable